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My LG Flatron L227WTG display won't accept it's full resolution of 1680x1050 when it comes from the mini DisplayPort (VGA). It WILL accept 1440 resolution, but not the 1680. I see no problems with the mini DVI port on my old MacBook.

Is this a problem with my display, cord, or did I just buy the wrong adapter? Would using a DVI input fix this? Or do I have to buy the upscaled HD Mini DisplayPort adapter instead?

I am using the Macpro for video editing.
I have attached an AOC 22" display but it is not sufficient as I need several windows and the workspace available is less. Will this connector help me to attach another 22" display at the same resolution (1680x1050)??

Can I connect the VGA/HDMI output of my Windows PC to the 27" iMac and use it as a monitor? and how do I switch between the functions? "monitor" & "iMac" ( by using the VGA / HDMI to Mini Displayport Adapter)

When I connect my late 2010 13" MacBook Air using the Mini Display Port to VGA Adapter to my Samsung 19" TV or to my View Sonic monitor the display is just fine but the sound keeps coming out of the laptop and not the TV. I have tried the sound settings in System Preferences but the Output menu doesn't show any device attached, just the internal speakers.